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Feat: added support for the SHT3x sensor #3095

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Feat: added support for the SHT3x sensor #3095

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c1a5fba
Added SHT3x sensor
Tomas-Kuchta-FPV Aug 1, 2026
c2d1126
Added a probe for INA226
Tomas-Kuchta-FPV Aug 1, 2026
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2 changes: 2 additions & 0 deletions platformio.ini
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Original file line number Diff line number Diff line change
Expand Up @@ -127,6 +127,7 @@ build_flags =
-D ENV_INCLUDE_BME280=1
-D ENV_INCLUDE_BMP280=1
-D ENV_INCLUDE_SHTC3=1
-D ENV_INCLUDE_SHT3X=1
-D ENV_INCLUDE_SHT4X=1
-D ENV_INCLUDE_LPS22HB=1
-D ENV_INCLUDE_INA3221=1
Expand All @@ -146,6 +147,7 @@ lib_deps =
adafruit/Adafruit BME280 Library @ ^2.3.0
adafruit/Adafruit BMP280 Library @ ^2.6.8
adafruit/Adafruit SHTC3 Library @ ^1.0.1
sensirion/Sensirion I2C SHT3x @ ^1.0.1
sensirion/Sensirion I2C SHT4x @ ^1.1.2
arduino-libraries/Arduino_LPS22HB @ ^1.0.2
adafruit/Adafruit MLX90614 Library @ ^2.1.5
Expand Down
34 changes: 32 additions & 2 deletions src/helpers/sensors/EnvironmentSensorManager.cpp
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Expand Up @@ -83,6 +83,14 @@ static Adafruit_BMP280 BMP280(TELEM_WIRE);
static Adafruit_SHTC3 SHTC3;
#endif

#if ENV_INCLUDE_SHT3X
#ifndef TELEM_SHT3X_ADDRESS
#define TELEM_SHT3X_ADDRESS 0x44
#endif
#include <SensirionI2cSht3x.h>
static SensirionI2cSht3x SHT3X;
#endif

#if ENV_INCLUDE_SHT4X
#ifndef TELEM_SHT4X_ADDRESS
#define TELEM_SHT4X_ADDRESS 0x44
Expand Down Expand Up @@ -314,6 +322,24 @@ static void query_shtc3(uint8_t ch, uint8_t, CayenneLPP& lpp) {
}
#endif

#if ENV_INCLUDE_SHT3X
static uint8_t init_sht3x(TwoWire* wire, uint8_t addr) {
// SensirionI2cSht3x::begin() does not probe the hardware; use readStatusRegister()
// as the actual presence check since it performs a real I2C transaction.
SHT3X.begin(*wire, addr);
uint16_t status = 0;
return (SHT3X.readStatusRegister(status) == NO_ERROR) ? 1 : 0;
}
static void query_sht3x(uint8_t ch, uint8_t, CayenneLPP& lpp) {
float temperature = 0.0f;
float humidity = 0.0f;
if (SHT3X.measureSingleShot(REPEATABILITY_LOW, false, temperature, humidity) == NO_ERROR) {
lpp.addTemperature(ch, temperature);
lpp.addRelativeHumidity(ch, humidity);
}
}
#endif

#if ENV_INCLUDE_SHT4X
static uint8_t init_sht4x(TwoWire* wire, uint8_t addr) {
// SensirionI2cSht4x::begin() does not probe the hardware; use serialNumber()
Expand All @@ -323,7 +349,8 @@ static uint8_t init_sht4x(TwoWire* wire, uint8_t addr) {
return (SHT4X.serialNumber(serial) == 0) ? 1 : 0;
}
static void query_sht4x(uint8_t ch, uint8_t, CayenneLPP& lpp) {
float temperature, humidity;
float temperature = 0.0f;
float humidity = 0.0f;
if (SHT4X.measureLowestPrecision(temperature, humidity) == 0) {
lpp.addTemperature(ch, temperature);
lpp.addRelativeHumidity(ch, humidity);
Expand Down Expand Up @@ -401,7 +428,7 @@ static void query_ina260(uint8_t ch, uint8_t, CayenneLPP& lpp) {
static uint8_t init_ina226(TwoWire*, uint8_t) {
// INA226 static instance was constructed with address and wire.
if (!INA226.begin()) return 0;
INA226.setMaxCurrentShunt(TELEM_INA226_MAX_AMP, TELEM_INA226_SHUNT_VALUE);
if (!INA226.setMaxCurrentShunt(TELEM_INA226_MAX_AMP, TELEM_INA226_SHUNT_VALUE)) return 0;
return 1;
}
static void query_ina226(uint8_t ch, uint8_t, CayenneLPP& lpp) {
Expand Down Expand Up @@ -570,6 +597,9 @@ static const SensorDef SENSOR_TABLE[] = {
#if ENV_INCLUDE_SHTC3
{ 0x70, "SHTC3", init_shtc3, query_shtc3 },
#endif
#if ENV_INCLUDE_SHT3X
{ TELEM_SHT3X_ADDRESS, "SHT3X", init_sht3x, query_sht3x },
#endif
#if ENV_INCLUDE_SHT4X
{ TELEM_SHT4X_ADDRESS, "SHT4X", init_sht4x, query_sht4x },
#endif
Expand Down